body{
    background: #2980b9;
}
.loading{
    position: absolute;
    top:50%;
    left:50%;
    transform: translate(-50%,-50%);
    display: flex;
    align-items: center;
}
.obj{
    width: 4px;
    height: 40px;
    margin-left: 4px;
    border-radius: 10px;
    background: #fff;
    animation: loading .8s infinite;
}
.obj:nth-child(1){
    animation-delay: .1s;
}
.obj:nth-child(2){
    animation-delay: .2s;
}
.obj:nth-child(3){
    animation-delay: .3s;
}
.obj:nth-child(4){
    animation-delay: .4s;
}
.obj:nth-child(5){
    animation-delay: .5s;
}
.obj:nth-child(6){
    animation-delay: .6s;
}
.obj:nth-child(7){
    animation-delay: .7s;
}
@keyframes loading{
    0%{
        height:0 ;
    }
    50%{
        height: 40px;
    }
    100%{
        height: 0;
    }
}